FatImageReader.h

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/*
 * FatImageReader.h
 *
 * Copyright (C) 2014 IBR, TU Braunschweig
 *
 * Written-by: Johannes Morgenroth <morgenroth@ibr.cs.tu-bs.de>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 *  Created on: Mar 14, 2014
 */

#ifndef FATIMAGEREADER_H_
#define FATIMAGEREADER_H_

#include "io/FATFile.h"
#include <ibrcommon/data/File.h>
#include <list>

extern "C" //libtffs does not support c++
{
#include <tffs.h>
}

namespace io
{
        class FatImageReader
        {
        public:
                class FatImageException : public ibrcommon::IOException
                {
                public:
                        FatImageException(int errcode, const std::string &operation, const ibrcommon::File &file);
                        virtual ~FatImageException() throw ();

                        int getErrorCode() const;

                private:
                        static std::string create_message(int errcode, const std::string &operation, const ibrcommon::File &file);
                        const int _errorcode;
                };

                class FileHandle
                {
                public:
                        FileHandle(const ibrcommon::File &image, const std::string &path);
                        virtual ~FileHandle();

                        size_t read(unsigned char *buffer, size_t buf_size);

                        void close();

                private:
                        tdir_handle_t _hdir;
                        tffs_handle_t _htffs;
                        tfile_handle_t _hfile;
                        bool _open;
                };

                FatImageReader(const ibrcommon::File &filename);
                virtual ~FatImageReader();

                typedef std::list<FATFile> filelist;

                void list(filelist &files) const throw (FatImageException);
                void list(const FATFile &directory, filelist &files) const throw (FatImageException);

                bool exists(const FATFile &file) const throw ();

                time_t lastaccess(const FATFile &file) const throw ();

                size_t size(const FATFile &file) const throw ();

                bool isDirectory(const FATFile &file) const throw ();

                FileHandle open(const FATFile &file) const;

        private:
                void update(const FATFile &path, dirent_t &d) const throw (ibrcommon::IOException);

                const static std::string TAG;

                const ibrcommon::File _filename;
        };
} /* namespace io */

#endif /* FATIMAGEREADER_H_ */